Interaction between the light quality and flowering time pathways in Arabidopsis
Adams, Sally, Allen, Trudie and Whitelam, Garry C.. (2009) Interaction between the light quality and flowering time pathways in Arabidopsis. Plant Journal, Vol.60 (No.2). pp. 257-267. ISSN 0960-7412Full text not available from this repository.
Official URL: http://dx.doi.org/10.1111/j.1365-313X.2009.03962.x
Flowering in Arabidopsis is accelerated by a reduced ratio of red light to far-red light (R/FR), which indicates the proximity of competitive vegetation. By exploiting the natural genetic variation in flowering time responses to low R/FR, we obtained further insight into the complex pathways that fine-tune the transition to flowering in Arabidopsis. The Bla-6 ecotype does not flower significantly earlier in response to low R/FR, but is still able to display other features of shade avoidance, suggesting branching of low R/FR signalling. Here we show that the muted flowering response of Bla-6 is due to high levels of the floral repressor FLOWERING LOCUS C (FLC), conferred by a combination of functional FLC and FRIGIDA (FRI) alleles with a 'weak' FY allele. The Bla-6 FY allele encodes a protein with a corrupted WW binding domain, and we provide evidence that this locus plays a key role in the natural variation in light quality-induced flowering in Arabidopsis. In Bla-6, FLC blocks promotion to flowering by reduced R/FR by inhibiting expression of the floral integrator FLOWERING LOCUS T (FT) in a dose-dependent manner. Reduction of FLC removes this obstruction, and Bla6 plants then exhibit strong induction of FT and flower early in response to a low R/FR signal. This paper illustrates the intricate interaction of environmental signals and genetic factors to regulate flowering in Arabidopsis.
|Item Type:||Journal Article|
|Subjects:||S Agriculture > SB Plant culture|
|Divisions:||Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010)|
|Journal or Publication Title:||Plant Journal|
|Number of Pages:||11|
|Page Range:||pp. 257-267|
|Funder:||Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC)|
|Grant number:||BBD0004831 (BBSRC), P12848|
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